243 citations · 2.3k across the 105 of their papers we have counts for
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cond-mat.str-el2016★ 3 cited
Quantum phase transitions: The mean-field perspective
Johannes Richter, Oleg Derzhko
To illustrate a simple mean-field-like approach for examining quantum phase transitions we consider the quantum Heisenberg antiferromagnet on a square lattice. The exc…
cond-mat.str-el2016★ 12 cited
Hubbard models with nearly flat bands: Ground-state ferromagnetism driven by kinetic energy
Patrick Müller, Johannes Richter, Oleg Derzhko
We consider the standard repulsive Hubbard model with a flat lowest-energy band for two one-dimensional lattices (diamond chain and ladder) as well as for a two-dimensional lattice…